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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb5b512b33b869deccfdf5bca6c922ec41d9d96fdcdb4ddd750e4865f0c8c8a' 
  AND token = 'Us8NgWxcJCymlT21TCuFC9r99Ondun0fU8dGgUh2hXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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