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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68aedd2f264e6c46bbb5069f969da1a3a6e944968b0cfb4e0ba865ed641280a' 
  AND token = 'UpwPGUi8kSeYrch9nXLgotsi4n8Pgup8tY7fXF1qd9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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