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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee4410a25bb74fce1ef07998d99bb1e93f2e2c28ac3df0e5a4f1a339d2f0f41' 
  AND token = 'a+Fe/lgqZyii4wY2/kR8BPRVjwzm3l4jmh3m38BBe6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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