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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd51610c41572687276a29664e2cddaafcc9dd7ab513aa76aaf7ec18998d7bb2' 
  AND token = 'BAd9DULJPs+/Yhex/04xOZruHMNCDTy7T/Di2+MtKz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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