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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e41a68b2033f4c7c014f1597f7a5a345f98ee58f8f878a8e74d4f582fe42c89' 
  AND token = 'Wp4kRA555TkkHFKhERjlIFndjJm8ZwTXmSEkffDfs1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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