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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfb4800ed97149182f0972bbe14ab3860f806a81f78afae7c28011c7bedd8e3' 
  AND token = '/yXOJ83YJ40pTifIlh3OLgKw/UTJd+cxhJMfARCxGzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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