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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a5b8048a7ee2682d1560c5ff7081430b2ec523d8ebd0eed8790b5d96c6eff7' 
  AND token = 'dOJHAmnBPTO/B5ynr7J4YcvaX66XS8XAN7eNjpWS3B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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