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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c553f102908a92f37fefacd9351574cc1ebe6de1ecbd234146538533ba2546' 
  AND token = '60at1bi1FHbHva+NUkQMqFX8XakZCL27J4bSKm9w0p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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