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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2708efef76c6d9d8a00eecf0a26cd549148ca2dbead23cb6962e5b5e7825de4f' 
  AND token = '68r2sKorZf39qyJ/Xll7NDnCti0vBLLIXolJWDdcZAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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