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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d1b70d332ac995a8b081935def623759bc7ecd0b999ff6754e3cf32cc1a92c' 
  AND token = 'bppwU7oDOn4rb1UZHUhOEuU/P+cbZ36OEZg8dsXA2Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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