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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdac0536bc3d940fa44882760e21f52e301f86a33d82352f26839b626f955582' 
  AND token = 'YwQZfGL8Y5thOpKwnHuorg7VXeri5qXJg2Y9Lnk3I64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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