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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52e04ec155b4dd04c1ae63da9c411f67abadf1db3a7c13f88b7b74d7d067182' 
  AND token = 'Z8at7ul8erZtID+Zm1apwtZEt/lbIlZBTD5VT1JEWAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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