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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088671b06b2409f11926582003221d71707823ca28fbea683cf4e56cb78a49ed' 
  AND token = 'YHkZEDVk4bx0Um3d2MZRpTILKXfPt4bPmpKB/WTOlfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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