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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30c4b69586b82e85e81bccdc01412836cf54655cbcef918d6d1f22a648cb1ad' 
  AND token = 'd5kFB2Jn4hAj2/ZK11kV0u3IImh+Bs2XPlboaZO6KFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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