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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76982558e81ee09e114d7673736d565e8315cd6a7d5cab2c646d48aa85ffc7d4' 
  AND token = 'k6d4/rhUFBDXV8cjqDXWU+d6JC5+cEmFCAgwU7QeLQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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