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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4077a8776794b7f925ba334cda236fbf6b1fcd50f68a04696cd13736ef9b329' 
  AND token = 'oncehBGqXCmUcv1vAFtXSJxua5FUt2pOCAFOTCFBdss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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