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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95c58087d0ca001bc878be4635a27366559071e9086a9221f435c5e94db7bd1' 
  AND token = 'TH8Kjd+rjz/b5YOEx1J9IozR4cA3o2Yo0hgpqhCpcE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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