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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988103ee26f5c96d72102c38157d83233a9721034be39e15f329f746354a0074' 
  AND token = 'hEUrtVsg/2NEli8tMwkXC7MtDeLihPXF1HomFEwpM5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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