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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dcdc9e59f1caf62cb481e743b24f6c1550fa8598a69c67382d1cec8c47d6db' 
  AND token = '5bLq2w4ldRUpzNI4cvdEbbUyZNd0zuftRcLiPjPQS0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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