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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cadf04d511ac103e96bc8a28f4c0cae679ca0255493a3b0f0661473b534f59b0' 
  AND token = 'zJPNH4E35J4H2q8WG0OUA222/iZOuasmbvtxNMr/4Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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