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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38027745bd025dee1324b0a793825231c81e0f8a80672fad2dbc928085bb5bba' 
  AND token = '+P2cLHelHLS6CU6RRvB54rRTkZA7bwX1IkaIS0HzqJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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