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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48c87ea9f5837b7b85c2bb6e81672787846356ac98bb71ce3c62f0b639372a3' 
  AND token = 'S+HL1aowa5zVg+YQT8l3zH7OQNPlss2T9YvwGEs6E8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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