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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9501c58902ee9e184a2cbb4c11066aa3d98b784249320d8839f06c8c0e1bd6' 
  AND token = 'Q/V7PGik7jr5mK+HNP6uri5wXrfW7hvi15LSdCJNmXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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