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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08eb2f874633d6fe72788aa7e0f5bca55fd9c1e7eb81aedab3f8f5f3483fda57' 
  AND token = '2oJFEesaRhwa5D4GsjF37IWZWYSiUiDulpnNL4ZemtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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