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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa78dc31ae6b3afb440a35d184261986be485567195b373e7ea3c290ee1ce5a' 
  AND token = 'yymzA2l2mz4sfrOZhrvBLd0xfaisWI9U5J+8Qn+HB1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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