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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2b10bbfef23b2cad190462294851cb57ea4634fd3e0bc1b024143842f1d5f7' 
  AND token = 'dSacHpsCdCrKUlHmY6W49J6WwUcJ7yBWtc6aJ7BfcPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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