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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfa9101721b113ea38b18fe2a6914b0312334b1be657c78b240416aca164be9' 
  AND token = '3+NUFcxwomX9RvXj0207oT6aNHL1NOe6UgV1X58+Fj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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