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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896c5e4914d0a7dec28a2b6ae5f21f7d18636168aba478ca7ee171b9809de8ba' 
  AND token = 'wNYuC4A88GSnl3ej5/tW8mPFnwv3fNtvI7ReX/v6HF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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