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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62104b64d6525ef9ff0396c1bd83a9192acb87305397b18bfabba6827608acb6' 
  AND token = 'Zk0zexOSqcijqXgxJxkqKykr59wJFhvTWlkE7rel8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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