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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c2ac5c5d181270eb716056658a4d76c77cab52016e1a345472fd1f74279b0c' 
  AND token = 'cvGHd1p5KxpL95yoblZ25jUkYjS1Hz6tYsJo9Om/5is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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