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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103e7737b1dac25904b210277e73f9d7abb5bbf44c442a4d0f2a25c7d7783440' 
  AND token = 'f6qhlMoCL30u+cTy4ZVSdNOFuMjZSa6M6lD6POrkRAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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