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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a795b7cef4dde9cc721b2fc4c7eafc7d2b1e9901efc0271030ac2ac06d5e69' 
  AND token = 'bCMKTYVocaJlS8horW5yK7WToHXRSEuSZI7dvNSuA3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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