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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed1dffa2d5d9ba784e0461575eae551a564526eb3ed9c82aebcc43d0a229407' 
  AND token = 'o7//qQFZSoZZibrnm6/Q/FZ4ghgU3+TzptaxG9vtaLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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