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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ed67e1a4e2a15bc44373c47295ef2af6b3568d5010f6e854b6b481b7105a67' 
  AND token = '84X14Rt5dSOKFUBeROoRs7bsGFKX+Y12SmK7DyVZDfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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