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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c3dcad3cae0bb92701a80a72867cc5af0e8d6d11db335b5e0096cecaa0bcee' 
  AND token = 'fIGgXxzrp4QIlJ0uOt3WyKyHvdkF6VAdGXXmhEJAOok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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