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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f198b5151ebe3fdd688027c9b391148384a7f04ee4f455d56492114d34029d8' 
  AND token = '+mNIincNqybZLdLlnIp1DiN0pz0r5gwTaYnh+1k7InQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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