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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc708f6820dfd0940cd2fedafa418224c3c28b76208cc08fbb0c2c9a9e6f88c' 
  AND token = '5U+PTz1a0tEbvvaGaSY9cpeYwx6Nsin1K6I+6dld8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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