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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0c59e4d8445ee2ae15f96e9fa1348cefb94c5f350da4eecdd55754270b72a7' 
  AND token = 'r5QtivpobUVHBLwxYi1Rw+ZuJaFy9ObetP34pVfyC1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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