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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3263401f60b4a5cd3ed19f858c5159b9a796c246e6b2ebe660332970ce5b3cec' 
  AND token = 'xp0yD/HKxrh2Tf8shPubrOoQZ0W7cv/oibdL8sgTS6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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