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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3581cd3057a07944e778d9f5ab8204d1c4618586dfea210bdadb0cd4fa51f0ee' 
  AND token = 'sGewaYTJIzArBrqXy3rnRr6ykbUp+bPNeiCSbGtzybs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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