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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec33fc769f4d4674b9ff2a69f32ad8d734bed4d0163b3fc609e0d5f0e58a6cc' 
  AND token = 'oKlbaQQ1LnOxUXXmNXxmxsTCciIkSmBUD4nuQjkRNXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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