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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67989233a9c7de44ce9d5fbaf0abb28028b62cac9d50c616d8bd6968d346e80' 
  AND token = 'RnplNT8drxcu9LgnWyatc0i6k9G1EUEc7gGsOQ3517I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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