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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f23ad7c6303247d21d0a2068ab302ff0d04974d3fb2e610b215afa4998758e' 
  AND token = 'NlUtM9oHJONxa3PNTYkDLNN1Cvvm+OAeIv7zk77ybK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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