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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ddb5315fb6b2ed97cfaafcf31e32a4f2d0e614e39eab60936565c63816a6d2' 
  AND token = '1/pobuCyEBk4GACO2ZGWkzYtMCTyn6rMl6Dxh2cL3vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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