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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ffd80806e3d3813c7f96f427eb86bd78ceef2a2f76b2470237f1c65615d428' 
  AND token = 'f56xnQt1yB3QPJk0KxxE9MfEnXzXFakeMRjfHlEAuAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}