SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b14c203cfd185639829826ad0ccf7c5681a3b4b84f56122b4e27f1f8fe994e' 
  AND token = 'SbQ7hzCNSr0q25tS+BqpYAbGi2XYxvtlrraV+EgPeuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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