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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cad97f953c38b1d5f1c7cbb08c0110d082ebc19f34783727ae1bc89dfdd70e' 
  AND token = 'M9ZT+2pSaOpTZalg8IAWRP2VN/FMqADWlgU/Mq0SUK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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