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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2575234f937a218de29fb45b50926e75ec4ddbd3502b0f759f846c8e7c920b' 
  AND token = 'l2mBrUk8bRXSc0yyKxiyC9BLIJspdUo4azAaqjKqhec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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