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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8174c9c9f0593e29bec0e71873475193d824669e5cd6c46bb7c4ee996695bc12' 
  AND token = '0ijqtVfJ/e2AZ9vxn8stqfaq2wAbRrzVAKxcPiEL+bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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