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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11bce2650c4cb75be58f412168892387d73b21feaf5dfdf2693fe74e35005686' 
  AND token = '0qJ81qX+vtgk25MgLGwr/YH1esyJD5UDojyE1841lJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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