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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431eb215d182b67c173c7917dafb1d6b7a0013d7116787a2b46816f6937c8a90' 
  AND token = 'WfGBMV4dnZrfhlv5q5Mk7NG0uL/4ca6DfOtmd3eRdD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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