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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2adde03b4457a3cdf10260ec3d0d5519063c1852b22fce0311f46973981978fa' 
  AND token = 'h+xOj8AeaMgoZcBboiUQEngR60Jvetj9aFukeVZGC2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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