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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6340e6551a613f179661163e3e2769288045b5ef98a521b7ca41ec4e88e6530e' 
  AND token = 'uG/lkpAAMyw5bUNY8ePcCbQaMq5kzv+VQfyKLyf4MRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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